<template>
  <div id="root">
  <div class="todo-container">
    <div class="todo-wrap">
      <MyHeader :todos="todos" @addObj="addObj" ></MyHeader>
      <MyList :todos="todos"></MyList>
      <MyFooter :todos="todos" @allCheckTodo="allCheckTodo" @clearAllTodo="clearAllTodo"></MyFooter>
    </div>
  </div>
</div>
</template>

<script>
import MyHeader from "./components/MyHeader.vue";
import MyList from "./components/MyList.vue";
import MyFooter from "./components/MyFooter.vue";
export default {
  components: { MyHeader, MyList, MyFooter,},
  data() {
    return {
      todos:JSON.parse(localStorage.getItem("todos")) || []
    }
  },
  methods:{
    //添加一个todo
    addObj(todoObj){
      this.todos.unshift(todoObj);
    },
    //更改todo状态
    checkDone(id){
      this.todos.forEach( todo => {
        if (todo.id == id) {
          todo.isDone = !todo.isDone;
        }
      })
    },
    //删除todo
    deleteTodo(id){
      this.todos = this.todos.filter( todo => todo.id != id )
    },
    //全选or全不选择
    allCheckTodo(value){
        this.todos.forEach( todo => {
          todo.isDone = value;
        })
    },
    //清楚所有已完成的todo
    clearAllTodo(){
      this.todos = this.todos.filter( todo => !todo.isDone )
    }
  },
  watch:{
    todos:{
      deep:true,
      handler(value){
        localStorage.setItem("todos",JSON.stringify(value))
      }
    }
  },
  mounted() {
    this.$bus.$on("checkDone",this.checkDone)
    this.$bus.$on("deleteTodo",this.deleteTodo)
  },
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}
.btn-edit {
  color: #fff;
  background-color: steelblue;
  border: 1px solid rgb(56, 105, 145);
  margin-right: 5px;
}
.btn-edit:hover {
  color: #fff;
  background-color: rgb(56, 105, 145);
}
.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>